Sharpener



FIG. 1 is a perspective view of a sharpener showing the new design;

FIG. 2 is a front side view thereof;

FIG. 3 is a back side view thereof;

FIG. 4 is a left side thereof;

FIG. 5 is a right side thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The dash-dash-dash broken lines depict portions of the sharpener that are not considered part of the claimed design. 

CLAIM A new, original, ornamental design for a sharpener, as shown and described. 